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@@ -3,9 +3,13 @@ This subpackage contains code to parse search queries received from the |
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frontend into trees that can be used by the database backend. |
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""" |
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from __future__ import unicode_literals |
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from shlex import split |
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from .nodes import * ## TODO |
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from dateutil.parser import parse as parse_date |
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from .nodes import (String, Regex, Text, Language, Author, Date, Symbol, |
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BinaryOp, UnaryOp) |
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from .tree import Tree |
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from ..languages import LANGS |
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@@ -15,6 +19,7 @@ class QueryParseException(Exception): |
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"""Raised by parse_query() when a query is invalid.""" |
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pass |
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class _QueryParser(object): |
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"""Wrapper class with methods to parse queries. Used as a singleton.""" |
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@@ -31,28 +36,52 @@ class _QueryParser(object): |
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} |
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def _parse_language(self, term): |
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"""Parse part of a query into a language node and return it.""" |
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## TODO: look up language ID |
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return Language(0) |
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def _parse_author(self, term): |
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pass |
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"""Parse part of a query into an author node and return it.""" |
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return Author(self._parse_literal(term)) |
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def _parse_date(self, term, type_): |
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"""Parse part of a query into a date node and return it.""" |
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if term.startswith(("before:", "b:")): |
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relation = Date.BEFORE |
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dtstr = term.split(":", 1)[1] |
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elif term.startswith(("after:", "a:")): |
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relation = Date.AFTER |
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dtstr = term.split(":", 1)[1] |
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else: |
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raise QueryParseException('Bad relation for date: "%s"' % term) |
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try: |
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dt = parse_date(dtstr) |
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except (TypeError, ValueError): |
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raise QueryParseException('Bad datetime for date: "%s"' % dtstr) |
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return Date(type_, relation, dt) |
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def _parse_modified(self, term): |
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pass |
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"""Parse part of a query into a date modified node and return it.""" |
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return self._parse_date(term, Date.MODIFY) |
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def _parse_created(self, term): |
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pass |
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"""Parse part of a query into a date created node and return it.""" |
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return self._parse_date(term, Date.CREATE) |
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def _parse_symbol(self, term): |
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"""Parse part of a query into a symbol node and return it.""" |
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pass |
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def _parse_function(self, term): |
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"""Parse part of a query into a function node and return it.""" |
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pass |
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def _parse_class(self, term): |
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"""Parse part of a query into a class node and return it.""" |
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pass |
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def _parse_variable(self, term): |
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"""Parse part of a query into a variable node and return it.""" |
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pass |
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def _parse_literal(self, literal): |
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